US1774690A - Safety valve - Google Patents

Description

Sept. 2, 1930.

v. wlLLouGHBY 1,774,690

SAFETY VALVE Filed Feb. 24, 1928 0. .50 MZ 32 44 4556 53 34 46 Z8 Z6 E I Il] j I l Q.

` vwemtoz Viclofmlauyz/y gf/J v 3 5 the upperedge of thecasing for limiting the Patented Sept. 2, i930 UNITED. STATES PATENT-"ortica vrc'ron WILLOUGHBY, or nrnenwoon, NEW JERSEY, AssreNon. 'ro AxnmcaN can.

' AND' noUNDRY oonrrANY, or NEW Yoan, N. Y., A conroaarIoN or NEW JERSEY.

SAFETY VALVE 'appiicauon med rem-nary 24, 192s. serial Ne. 256,686. i

Reference is had` to the accompan ing drawin which illustrate the preferred orn of the invention; though it is'to be understood that the invention is not limited to the exact details of construction shown and described, as it is obvious that various modi cations thereof within the scope ofthe claims will occur to persons skilled in the art.

In the drawings: yThe figure is a' ,vertical sectional'vie'w of;

the valve.

This invention relates to safety valves, and it is one object of -the invention to provide an improved safety valve for use in tanks or otherlike devices where such valves are de- I sirable.

Another obect of the invention is the-proivision of a sa ety valve of the kind 4described Bis employed. The valve B comprises pr1- maril in which leakage is prevented bythe utiliza-v tion ofa'suitable gasket.

further object'of the` invention is the provision of a safety-valve having a gasketl for preventing leakage, which gasket is replaceable while there is pressure in the tank. g1'

`Other ob'ects and6 advantages of this in vention wil be apparent from thefollowing descriptiontaken with the accompanying a tank, or `any 'other suitable container with which a'saf'ety valve indicated generally at a casing 2 which is threadedlyfengag in the tank or receptacle as shown at 4l and is'provided with .a collar 6 adjacent positioning of the valve, as will be apparent;

theJ collar being adapted to seat on the outer v surface of the tank A.

tends, the latter extending through a'fr'ustoconical guide 12, which is, in efect,.the' reduced lower end ofthe casing 2. This reduced end or guide 12. defines a'bearing-sur- :face or flange' 14 against which a spring 16 seatSf) The'outer-end of the springt 16 lis supported by a follower 18 carried or suprted by nuts-20 adjustable on the threaded ower end 2 2 of the valve stem., Forv obvi- -ous purposes, a` washerv24 is interposed bestem but adjacent the upper end thereof, and

said u'pper end ofthe valve stem is reduced and exteriorly threaded as at 30 to .receive nuts 32 which serve to secure a protective cap 34 mounted on the valve stem; a suitable' washer-33 being interposed between the lower nut 32'and the cap 3 4 for an obviouspurpose. A

vThe cap 34 is more particularly of theform shown, being of inverted dish shape and having abase 36 and a depending annular flange 38 which overlaps the upper end of the casin 2. The inner surface of the base is provide .withgacentral projection or bearing surface 40 having fan* annular bevelled edge 42'and a circumferential rib 44 which is adapted to restrain al resilient gasket 46 against lateral.

shifting and which serves -to position said gasket.- The 'gasket 46 is "of a diameter 28 so as to overlie the juncture of the valve and. valve seat to ther, the gasket 46,' eing of'resilient mate drawings 1n which A indicates a portion of' rial, Teadlly conforms t :um "Shape Shown when the nuts 32 are screwed home to secure the cap-imposition withthe bearing portion eater than the upper surface of the valve" revent leakage. Furso '40 in engagement with the gasket. It will be obvious from aninspectio'n ofthe drawings thatwhen the cap is being]l against the gasket, the edge' of t e gasket will be forced upwardly due tothe engage-` ment of the'rib 44 so that'the upper annular 'gagement with the bevelled'surface 42, and further, it will be apparent that the gasket will he forced to engagement with the valve secured edge of the gasket will helarranged in enseat; the arrangement providing in eifecta gasket havin mg ilange'w ich conforms the valve seat and the bevelled surface 42.

y The casing` '2 is provided with transverse nal bore 8 wherebyto established commumcation from the interior of the or other an annular pwardly extend- Ikto-th'e shape of 95 bores 48 ladjacent itsl lowerend, and just above the frustoconical guide 12, which bores 'or passages communicate'with the longitudireceptacle to the atmosphere when pressure within the tank is suicient to raise the valve from its seat.

The upper end of the valve stem 10 is provided with a slot for engagement by a suitable tool whereby to adjust the nuts 20 on the threaded end 22 to take up or ease the tension of the spring 16 to effect proper operation of the safety valve. Y

It is believed that the operation of the safety valve just described will be fully apparent to those skilled in the art Without further elaboration, but attention is called to the fact that the device of the present invention is of extreme simplicity, and is strong and durable in construction, and in addition, the parts are s connected that byy backing olf the nuts 32 and removing the cap 34 it is possible to replace the gasket 4G while there is pressure in the tank; the valve 28 'serving to efectually seal the interior of the valve casing against leakage.

What is claimed is:

l. In a safety valve, a hollow7 casing open at its upper end and having its upper inner edge beveled to provide a valve seat, the lower end of said casing being closed and providedwith an externally arranged apertured extension having an annular shoulder defining a spring seat, inlet passages formed in the wall of said casing and communicating with the interior thereof, a valve stem arranged in the casing and extending through the aperture in the extension, a valve intermediate the ends of said stem and normally seating on a portion only of the valve Seat,

a spring seat on thevalve stem, a spring inv terposed between said spring seats for normally retaining the valve on its seat, an annular shoulder formed on the casing adjacent the upper edgfe thereof, a cap on the upper end of the valve stem having a depending marginal flange and an internal annular projection, 'a gasket secured to said valve by the cap and engaging the valve seat, the said projection serving to aid the gasket in effecting a s'eal at the juncture of the valve and valve seat, said marginal flange on said cap skirting the upper end of the casing when the valve isl in seated position.

2. In a safety valve, ahollow casing open at its upper end and having its upper inner edge beveled to provide a valve seat, the lower end of said casing being closed and provided .l with an' externally arranged apertured extension having an annular shoulder ldefining a spring seat, inlet passages formed in the wall of. said'casing and communicating with the interiorthereof, a valve stem arranged in the casing and extending through tlie a erture inthe extension7 a valve inter-me iate the ends of saidstem and normally seating onza ,portion only ofuthe valve seat, a spring seat on the valve stem, a spring interpose between saidl spring seats forl normally reseat to effect a seal at the juncture of the valve and valve seat, and a gasket securing element carried by the valve stem and held against I said gasket, said element having an internal projection embedded in said gasket.

3. In a safety valve, a hollow casing having a valve seat at its upper end and having its lower end closed and provided with an externally arranged apertured extension having an annular shoulder defining a spring seat, inlet passages formed in the Wall of said casing andcommunicating with the interior thereof, a valve stem through the aperture in saidextension and having its ends arranged outside of the casing, a valve and a gasket normally co-operating with the valve seat to effect a closure7 said gasket being accessible for replacement while said valve is in its seated position and subjected to fluid pressure, a spring seat adjacent the lower end of the valve stem, and spring means interposed between said spring seats for normally retaining the valve on its seat.

In witness whereof I have hereunto set my extending y

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